I am adding one panel to another panel it works but circle which is in inspanel not shown. how can i solved this.
I am using below code. It works but not show circle
public static int xTemp = 0;
public static int yTemp = 0;
private void button1_Click(object sender, EventArgs e)
{
Panel insPanel = new Panel();
Random xRandom = new Random();
xTemp= xRandom.Next(20,100);
Random yRandom = new Random();
yTemp = yRandom.Next(20, 100);
insPanel.Location = new Point(xTemp, yTemp);
insPanel.Width=40;
insPanel.Height = 40;
insPanel.Visible = true;
insPanel.BorderStyle = BorderStyle.FixedSingle;
insPanel.Paint += new PaintEventHandler(insPanel_Paint);
panel1.Controls.Add(insPanel);
}
void insPanel_Paint(object sender, PaintEventArgs e)
{
System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Red);
System.Drawing.Graphics formGraphics =this.CreateGraphics();
formGraphics.FillEllipse(myBrush, new Rectangle(xTemp,yTemp, 10, 10));
myBrush.Dispose();
formGraphics.Dispose();
}
Main issue: you're trying to draw your circle at wrong coordinates.
xTemp and yTemp are coordinates of insPanel relative to panel1. But when you drawing your circle, you should use coordinates relative to panel you're drawing at - insPanel.
Another issue: there is no need to create and dispose graphics each time you're drawing something on your panel. You can use e.Graphics from Paint eventhandler arguments.
Based on above, your code could look like:
void insPanel_Paint(object sender, PaintEventArgs e)
{
using (var myBrush = new SolidBrush(Color.Red))
{
e.Graphics.FillEllipse(myBrush, new Rectangle(0, 0, 10, 10));
}
}
Also note - since paint event can occur very frequently, it could be a good idea not to create and dispose brush every time, but use brush cached in your class private field.
Use e.Graphics instead of this.CreateGraphics:
System.Drawing.Graphics formGraphics = e.Graphics;
One more issue is you're getting coordinates in range of 20 - 100 (xRandom.Next(20,100)) and your panel dimensions are just 40, 40.
Related
I'm trying to call a method which draws something in a panel from another class, but something doesn't work.
This is the drawing method:
class Dibujo
{
public void Dibujar(Object sender, PaintEventArgs e)
{
Form2 ventana2 = new Form2();
Graphics g = ventana2.panel1.CreateGraphics();
Pen Boli = new Pen(Brushes.Green);
Point Inicio = new Point(200, 100);
Point Final = new Point(400, 300);
g.DrawLine(Boli, Inicio, Final);
}
}
}
And here is were I call it:
private void btnDibujar_Click(object sender, EventArgs e){
Graphics g = panel1.CreateGraphics();
Rectangle rect = new Rectangle();
PaintEventArgs pe = new PaintEventArgs(g,rect);
Pen Boli = new Pen(Brushes.Red);
g.DrawLine(Boli,100,100,100,300);
Dibujo panel = new Dibujo();
panel.Dibujar(sender,pe);
}
So the idea is that when I click the button btnDibujar_click a simple line is drawn in the panel but it doesn't work. I know that the code probably has a lot of mistakes but I'm a beginner and I'm learning by myself so all kinds of advice is welcome.
I am creating a Graphics Form where objects with coordinates x,y are being drawn into the Graphics. It works properly for small x and y, but when I want to draw them in different place (f.e. x = 500, y = 300) they disappear.
public WindowHandler()
{
dc = this.CreateGraphics();
this.Size = new Size(sizeX, sizeY); // 800x600
startSimulation = new Button
{
// button properties
};
this.Controls.Add(startSimulation);
startSimulation.Click += new EventHandler(StartSimulationClick);
}
private void CreationsMethods()
{
creations.PaintAllAnimals(dc);
}
public void PaintAllAnimals(Graphics g)
{
foreach (var animal in ecoStructure.world.animals)
{
animal.PaintAnimal(g);
}
}
public void PaintAnimal(Graphics graphics)
{
Rectangle rectangle = new Rectangle(x, y, 3, 3);
Pen pen = new Pen(colour);
graphics.DrawRectangle(pen, rectangle);
graphics.FillRectangle(colour, rectangle);
}
I want to put all the objects onto the window. Is there any way to make the Graphics "bigger"? Do I need to make another one? Or should I use different tool to draw rectangles?
Thanks to #Chris Dunaway for posting an answer in comment.
So I deleted the CreateCraphics, and instead of that i am now using an OnPaint method. It works slowly, but works. So I will try to make it as fast as i can. For now, I just created this. NextStepClick is how I use the OnPaint to paint the rectangles.
private void CreationsMethods(object sender, PaintEventArgs e)
{
dc = e.Graphics;
base.OnPaint(e);
creations.PaintAllAnimals(dc);
}
private void NextStepClick(object sender, EventArgs e)
{
this.Refresh();
picBox.Paint += new System.Windows.Forms.PaintEventHandler(CreationsMethods);
}
Trying to draw a shape over existing panels for a good while, but by now out of ideas. Could somebody help me out, please? It ends up always behind the panels (and pictureBox /the grey one/). I tried 3 different ways, whithout success. this is my code:
namespace DrawingOnFront
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void panel11_MouseClick(object sender, MouseEventArgs e)
{
DrawIt(90, 70);
}
private void DrawIt(int x, int y)
{
Rectangle Circle = new Rectangle(x,y,40,40);
SolidBrush Red = new SolidBrush(Color.Red);
Graphics g = this.CreateGraphics();
g.FillEllipse(Red, Circle);
/*
Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
Graphics g = Graphics.FromImage(bmp);
int width = pictureBox1.Width /4;
int height = pictureBox1.Height /2;
int diameter = Math.Min(width, height);
g.FillEllipse(Red, x, y, width, height);
pictureBox1.Image = bmp;
*/
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
using (Graphics g = e.Graphics)
{
Rectangle Circle = ClientRectangle;
Circle.Location = new Point(100, 60);
Circle.Size = new Size(40, 40);
using (SolidBrush Green = new SolidBrush(Color.Green))
{
g.FillEllipse(Green, Circle);
}
}
}
}
}
Sorry for this basic lama question, probably for most of you it is very easy, I am still learning it. Thanks a lot in advance.
My comments above apply. Here is an example of how to draw onto each control and the form separately:
We best have a common drawing routine that we can call from the Paint event of each participating element, in our case a Panel, a PictureBox and the Form.
The trick is for all nested elements to draw the circle shifted by their own location. To do so we pass these things into the drawing routine:
a valid Graphics object. We get it from the Paint events.
and a reference to the control; we use it to offset the drawing on each control (except the form) with Graphics.TranslateTransform..:
Result:
As you can see it looks as if we painted one circle over all elements but actually we drew three circles, each onto one element..:
private void canvasForm_Paint(object sender, PaintEventArgs e)
{
draw(sender as Control, e.Graphics);
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
draw(sender as Control, e.Graphics);
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
draw(sender as Control, e.Graphics);
}
private void draw(Control ctl, Graphics g)
{
Rectangle r = new Rectangle(200, 100, 75, 75);
if (ctl != canvasForm) g.TranslateTransform(-ctl.Left, -ctl.Top);
g.FillEllipse(Brushes.Green, r);
g.ResetTransform();
}
Note that the same result could be created with three calls, one FillRectangle, one DrawImage and one FillEllipse :-)
I want to detect mouse click on my custom created region.
1) I ve tried this code with rectangle and it worked, but with string it doesnt
GraphicsPath gp = new GraphicsPath();
Region reg = new Region();
private void Form1_Load(object sender, EventArgs e)
{
gp.AddString("TEXT", new FontFamily("Arial"),0, 20.0f, new Point(300, 10), StringFormat.GenericDefault);
gp.Widen(Pens.AliceBlue);
reg = new Region(gp);
}
and here is the part2
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
if (reg.IsVisible(e.Location))
{
MessageBox.Show("aaaa");
}
}
It doesnt show the message box. :)
EDIT :here is my Paint event to see where my string is
private void panel1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawString("TEXT", new Font("Arial", 20), Brushes.Yellow, 300,100 );
}
The most basic error is a typo: One time you draw at y = 10, the other time at y = 100.
But there is another issue which is not so obvious at all:
Add
e.Graphics.FillPath(Brushes.Firebrick, gp);
to the Paint event and you'll see it: The fonts have quite a different size.
That is because when adding text to a GraphicsPath it is using a different scale (called 'emSize') than Graphics.DrawString does, which uses 'Point'.
To adapt you can use this:
float fontsize = 20.0f;
using (Graphics g = panel1.CreateGraphics()) fontsize *= g.DpiY / 72f;
Now you can build the GraphicsPath, best with the correct coordinates..:
gp.AddString("TEXT", new FontFamily("Arial"), 0, fontsize,
new Point(300, 100), StringFormat.GenericDefault);
I made an user control and I draw a rectangle directly in the window, like this (this is a simplified version):
private int rec_len = 200;
private void Draw_()
{
Pen pn = new Pen( Color.Black, WIDTH_LINE );
Graphics graph = this.CreateGraphics();
graph.Clear( Color.Transparent );
this.Refresh();
graph.DrawRectangle( pn, 20, 10, rec_len, 40 );
this.Refresh();
graph.Dispose();
}
public void button_Build_Click( object sender, EventArgs e )
{ rec_len += 10; Draw_(); }
The strange thing is that the second refresh actually poses a problem: if I comment it out, the rectangle is visible, if I let it in the code, the rectangle is not visible. In the real code I have to draw more than a rectangle and I want the refresh at the end, otherwise the background is visible between the moment I erase old drawing and the moment the new one is ready.
The surface of a control is not stored: When you paint on a control, the drawing is not saved and need to be redrawn each time the control is repainted (After a refresh for example). To create a persistante graphic, you can create a bitmap, draw on the bitmap and assign this bitmap to the BackgroundImage property.
Bitmap bmp = new Bitmap(WIDTH, HEIGHT);
void Initialize()
{
this.BackgroundImage = bmp;
}
private int rec_len = 200;
private void Draw_()
{
Pen pn = new Pen(Color.Black, WIDTH_LINE);
using (Graphics graph = Graphics.FromImage(bmp))
{
graph.Clear(Color.Transparent);
this.Refresh();
graph.DrawRectangle(pn, 20, 10, rec_len, 40);
this.Refresh();
}
}
public void button_Build_Click(object sender, EventArgs e) { rec_len += 10; Draw_(); }